In the Easter egg, the Homsar chimes play G, F, E, and D from left to right, which correspond to the tonal 5, 4, 3, and 2 in the key of the toon's song. However, during the toon, they play D/F—one chime somehow plays two pitches—G, A, and B.

The brass run played while the horn (French horn) appears on-screen is near the extreme low end of the instrument's range.

This marks the first time any character has identified the Thnikkaman as Bubs. It had been a running gag since his first appearance to wonder about his true identity.

The Dethemberween Thnikkaman's "unmarked van" is very clearly marked with his signature "tH" symbol on the side.

Near the beginning, Strong Sad's eyes seem further apart than usual.

When Strong Bad answers the Thnikkaman's phone call he reaches underneath his desk to answer, making one assume he keeps his phone on the floor, as Strong Bad's desk has no drawers. The phone could have been pulled out of hammerspace.

In order to put his arm around the snow Thnikkaman, Strong Bad's reach is far longer then what his normal arm length is.

When the cartoon cuts to the scene with the sheriff, the Thnikkaman's unmarked van does not appear to have anyone driving it; the steering wheel and stars are clearly visible through the window, though neither the Thnikkaman nor any other driver is seen. This is seen easily if you zoom in.

All of the snowflakes, including those on Strong Mad's sweater, are four/eight-sided, rather than the usual six.

When the sticky note of "th" appears over Decemberween, the shadow doesn't show that the sticky note was put on.

Just before the Decemberween Thnikkaman song, Strong Bad appears smaller than usual.

At one point, The King of Town, Strong Sad, Homestar, and Coach Z all appear from behind Strong Mad, similar to how The Cheat, Homestar, Strong Mad, Bubs, and Coach Z all appear from behind Strong Bad in Some Stupid Turkey.

Additionally, he appears to represent Burl Ives, who voiced Sam the Snowman in Rudolph the Red-Nosed Reindeer but was also known as a country singer and western movie star.

The Dethemberween Thnikkaman's cry of "Yeah, shut up! To one and all o' dang y'all!" is a parody of Santa's final line in The Night Before Christmas: "Happy Christmas to all, and to all a good night!"

The falling apple on the blackboard refers to Newton's apple, a popular story claiming that Isaac Newton was inspired to formulate his theory of universal gravitation by the fall of an apple from a tree.